Appeal when vehicle overturns in amateur races (7)
I believe the answer is:
attract
'appeal' is the definition.
(thesaurus)
'vehicle overturns in amateur races' is the wordplay.
'vehicle' becomes 'cart' (cart is a kind of vehicle**).
'overturns' is a reversal indicator.
'in' indicates putting letters inside.
'amateur' becomes 'a'.
'races' becomes 'tt' (Isle of Man Tourist Trophy races).
'cart' backwards is 'trac'.
'a'+'tt'='att'
'trac' placed into 'att' is 'ATTRACT'.
'when' acts as a link.
(Other definitions for attract that I've seen before include "Draw towards, being magnetic" , "'Draw, charm (7)'" , "Exercise a magnetic influence" , "Draw towards or get attention of" , "Entice" .)